Park, License, and/or Tail Lamps Malfunction
Park, License, and/or Tail Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Battery voltage is applied at all times to both the coil and switch sides of the Park Lamps Relay located in the underhood fuse block. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp signal circuit to the body control module (BCM). The BCM responds by applying ground to the park lamps relay control circuit. This energizes the park lamps relay coil causing the relay switch contacts to close allowing battery voltage to flow through the park lamp fuses to all of the park, tail, license, and marker lamps.
Reference Information
Schematic Reference
Exterior Lights Schematics Exterior Lights Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Exterior Lighting Systems Description and Operation Exterior Lighting Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Park Lamp Switch parameter while turning the headlamp switch between the OFF and PARK positions. The parameter should change between Active and Inactive.
If the parameter does not change between the commanded states, refer to Park Lamp Switch Malfunction.
If the parameter changes between the commanded states, refer to Park, License, Marker, and/or Tail Lamps Malfunction.
Circuit/System Testing
Park Lamp Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal 4 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Park Lamp Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 body control module.
4. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Park Lamp Switch parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
5. If all circuits test normal, replace the S30 headlamp switch.
Park, License, Marker, and/or Tail Lamps Malfunction
1. Ignition OFF, disconnect the KR53 park lamps relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
3. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the KR53 park lamps relay.
4. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
5. Ignition OFF, disconnect the harness connector at the inoperative park/license/marker lamp.
6. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground:
* E13L headlamp - left terminal 1
* E13R headlamp - right terminal 1
* E42L tail lamp assembly - left terminal 2
* E42R tail lamp assembly - right terminal 2
* E2LF side marker lamp - left front terminal 1
* E2RF side marker lamp - right front terminal 1
* E7L side marker lamp - left front terminal 2
* E7R side marker lamp - right front terminal 2
• If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the inoperative park/license/marker lamp.
8. Connect a 20 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the park/license/marker lamps illuminate.
• If the park/license/marker lamps do not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the inoperative park/license/marker lamp.
9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
10. Command the Parking lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 body control module.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
11. If all circuits test normal, replace the KR53 park lamps relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Headlamp Switch Replacement Service and Repair
* Rear License Plate Lamp Replacement Rear License Plate Lamp Replacement
* Parking and Turn Signal Lamp Replacement Service and Repair
* Front Side Marker Lamp Replacement Service and Repair
* Front Position Lamp Bulb Replacement Front Position Lamp Bulb Replacement
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Stop and Tail Lamp Bulb Replacement Stop and Tail Lamp Bulb Replacement
* Control Module References Control Module References for BCM replacement, setup, and programming